CO has a good point, it not just "vitrol". Lucas has been notorious with putting out bullshit spins on things. Sometimes its probably just for simplicity's sake, sometimes its deliberate misdirection for promotional means. As far as his claim of consulting a psychologist, I have a feeling the reality is that he simply had a friend in the field of psychology and said, "so, this isn't going to like scar kids is it? It's kind of intense." Maybe he just looked it up in one of his psychology books and found that kids responding to situations like this will resort to denial (i.e., Vader's trying to trick Luke). Because if he actually did go to a real, live pyschologist and the guy said "yeah, this might be too intense for small kids", what was Lucas going to do? Scrap the entire father point? Well maybe, but then if it was REALLY the central element of his masterminded Tragedy of Darth Vader that was his "vision" that he was never going to compromise, the fact that he's Luke father is the entire point of the story's existance. I also find it hard to believe he brought the biggest plot twist for the biggest film of all time to someone outside of his circle.

The reality is probably that Lucas had a justified curiosity if he was taking things a bit too over the top and looked into what psychology had to say, and to his relief he found a convenient way to continue on without guilt. Maybe this entailed going to a real professional or someone in a related field of psychology for advice, but considering this was the biggest secret plot twist in movies at that time I would not think it realistic to go to anyone but a trusted friend. Still, the larger point brought up stands: he WAS showing concern for the children in the audience by looking into the matter, regardless of the extent this entailed. I don't believe he made it all up out of thin air, there is likely to be some truth in it.